Skip to Main Content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.

European Union Law: Institutions and Sources

This guide provides an overview of the structure and lawmaking activities of the EU Institutions as well as resources for EU research.

The European Parliament

Originally, the Treaty of Rome gave the European Parliament an advisory role only.

Subsequent treaty provisions have strengthened this role culminating in the co-decision procedure established by the Treaty of Amsterdam.  A legal act is made law only if the Council and Parliament agree.  If disagreement exists, a conciliation committee may be convened comprised of members of the Council and Parliament with the attendance of the Commission.   In certain circumstances, the Parliament may request that the Commission put forward a proposal to the Council.  The Parliament may also institute proceedings against an institution for a treaty violation.


European Parliament Website